# How to verify I'm now using TLS 1.2 **URL:** \ **Category:** Get Help\ **Tags:** tls\ **Created:** [February 3, 2021, 11:42pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318 "2021-02-03T23:42:24Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![boggs](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/boggs/32/15261_2.png) [@boggs](https://community.auth0.com/u/boggs)\ **Post date:** [February 3, 2021, 11:42pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/1 "2021-02-03T23:42:24Z")
I _believe_ I’ve modified my .NET app to now use TLS 1.2 and above automatically. It’s using .NET Framework 4.7.2 and the server O/S supports TLS 1.2. But how can I verify the app is actually using 1.2? I don’t want to be caught on March 22nd with a non-working app and a bunch of calls from angry users. Auth0 sent an email warning about the problem, so how did you know? Is there a method or tool available to check which TLS version is actually being used? ---
**Author:** ![stephanie.chamblee](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/stephanie.chamblee/32/26087_2.png) [@stephanie.chamblee](https://community.auth0.com/u/stephanie.chamblee)\ **Post date:** [February 4, 2021, 4:51pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/2 "2021-02-04T16:51:50Z")
Hi @boggs, Welcome to the Community! You should be able to see what type of connection you have in the browser in the security tab of Chrome dev tools: [Chrome DevTools - Chrome Developers](https://developers.google.com/web/tools/chrome-devtools/security) ---
**Author:** ![andrei.ogleznev](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/andrei.ogleznev/32/27434_2.png) [@andrei.ogleznev](https://community.auth0.com/u/andrei.ogleznev)\ **Post date:** [February 5, 2021, 4:08pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/3 "2021-02-05T16:08:57Z")
Hi guys, could you please tell me how to verify that in case of native desktop application? Can Auth0 provide us with any sandbox to check if the apps survive after March 22nd? ---
**Author:** ![michael.kiff](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/michael.kiff/32/12765_2.png) [@michael.kiff](https://community.auth0.com/u/michael.kiff)\ **Post date:** [February 5, 2021, 5:01pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/4 "2021-02-05T17:01:19Z")
You can probably use fiddler to check this. [See here.](https://www.stoneedge.com/check-tls-1-0-traffic/#:~:text=Under%20the%20Start%20Menu%20in,checkbox%20for%20Decrypt%20HTTPS%20traffic.) Definitely scary not having any provided way to fully verify before the 22nd though. ---
**Author:** ![andrei.ogleznev](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/andrei.ogleznev/32/27434_2.png) [@andrei.ogleznev](https://community.auth0.com/u/andrei.ogleznev)\ **Post date:** [February 5, 2021, 6:35pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/5 "2021-02-05T18:35:16Z")
Thank you for the suggestion. I think I will try that. ---
**Author:** ![boggs](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/boggs/32/15261_2.png) [@boggs](https://community.auth0.com/u/boggs)\ **Post date:** [February 12, 2021, 6:56pm UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/6 "2021-02-12T18:56:51Z")
Thank you Stephanie, that was the simple exact answer I needed. ---
**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\ **Post date:** [February 25, 2021, 9:57am UTC](https://community.auth0.com/t/how-to-verify-im-now-using-tls-1-2/57318/7 "2021-02-25T09:57:59Z")